Xf dayton



W. H. PETIT May 24, 1927.

CONDENSER Filed May26, 1922 (futon/w13 Ul A Patented May 24, 1927. l

UNITED STATES 4Parnufr*goifrlcn.

WILLIAM H. rnri'r, or DAYTON, onto, ASSIGNOR 'ro THEIMIAMI RADIO ooRroRA'rIoN l COMPANY, OF DAYTON, OHIO, A CORPORATIONJOF OHIO.

A ooNDENsER.

Application filed May 26,

This invention relates to condensers and more particularly to a variable condenser which is designed primarily for use with. radio telephonie apparatus.

One object of the invention is to provide a simple, efficient condenser whichwill be very compact in forni and which lwill have a relatively high capacity.

A further object of the invention is to provide a condenser of such acharacter that a plurality of condensers, or units, each complete in itself, may be connected together and operated under a single control to provide a condcnserof a larger capacity.

A further -objectfof the invention is to provide in connection with such a condenser a fine adjustment condenser' which can be connect-ed with and made structurally a part of the condenser, but will be operated separatelyy therefrom.

Other objects of the invention will appear as the device is described in detail.

In the accompanying drawings Fig. lis a sectional viewtaken centrally through a condenser embodying my invention; Fig. 2 is an elevation vof the inner side of oneV section 'of the casing; Fig. 3 is a detail view of the movable condenser plate; Fig; 4 is a detail view of one ofthe stationary con"- denser plates; Fig. 5 is a detail view of the dielectric; Fig, 6 is a sectionalidetail view showing the manner vof connecting together the two condensers; Fig. 7 is a detail view of the resilient washer; and Fig. 8 is a detail view of the Connector bar. V

In these drawings I haveillustrated one embodiment of my invention, but it will be understood that this has been shown lfor the purpose of illustration only and that various modifications may be made therein without departing from the spirit of the invention. n i

As shown in these drawings the condenser comprises a casing consisting of two sections l rigidly connected one to the other and arranged to provide between them a chamber within which the condenser plates are located. As here shown, the two sections of the casing are identical and are interchangeable. Preferably each section of the casing consists of a disk of suitable insulating material having a circumferential flange Z e2;- tending laterally from one face thereof, the iianges being so arranged that when the flanged sides of two sections are placed to i922. serial No. 563,976.

gether portions of the adjacentvfaces of the sections will be separated to. provide theV chamber.

The twov sections may be connected one to the other in any suitable manner, as by means of screws l3. Arranged within the chamber thus formed between the two .sections of the casing'. are stationary condenser plates l which, in the present-corr.

struction, are substantially semi-circular in 'shape and are supported on the respective I prefer to `mold the condenser plates l into the casing `sections. the casing being `preferably formed l sections l of the casing.

tially their full thickness in the walls of the casing so that their inner'faces arel substair tially flush with the inner faces of the adjacent portions of thef'casing sections. Suit-- able means are provided'for connecting the conde'nser'plates inthe circuit, and as vhere lshown each'plate has rigidly connected therewith and preferably formed integral therewith a tongue, or projection, 6 which extends beyond the edge of the casing and,

in the present instance. the twov tongues are j connected one to the other by a bolt 7 which serves as va binding post. As `has` been stated, the inner faces of the two sections of i the casing are spaced apart and inasmuch as the condenser plates are mounted in and flush with the walls'of this chamber it will..

be apparent that the condenser plates are spaced apart and may receive between them movable condenser plate', 'The movable condenser plate is shown at 8 and is also substantially semi-circularv in shape. It is mounted for rotation within the chamber of `the casing so V.that it 'can be movedwholly into the space between the two stationary condenser plates or entirely withdrawn from that space. In the presentconstruction the movable plate is mounted on a short, hollow shaft 9 which is journaled in the two sections of the casing and is, in the present instance, provided withan integral collar 10 between which and a movable collarl 1l the hub port-ions 12 of the movable condenser plate is clamped so as to rigidly connect the same with the shaft 9. vThe collar ll may be positioned on the shaft 9 in any suitable llO be mounted about the hollow shaft 9. Their shape and arrangement is such that they Awill at all times completely Separate the stationary condenser plates from the movable condenser plate and it is immaterial whether or not they are held rigidly against movement. By the use of these sheets of dielectric material l am enabled to greatly reduce the distance between the condenser plates and still maintain a high insulation value between them. The movable condenser plate may be connected in the circuit in any suitable manner, but in the present form of the device eachl section 1 of the casing is provided with a conneetorbar 14, the inner end of which, 15, encircles the hollow shaft l9 and is maintained in firm electrieal connection with a part of that shaft and. therefore, with the movable plate. Preferably the opening in the hub portion 15 of each connector bar 1li is surrounded by a laterally extending flange 1G which enters the opening` in the section of the casing and forms a bearing in which the shaft 9 is journaled. As here shown, the connector bars are molded in the two sections of the casing and their outer ends are brought together and connected by a bolt 17 which constitutes a binding post. If desired, additional means may be provided for insuring a lirm electrical contact between the connector bars and the hollow shaft 9, and, in the present instance, I have interposed resilient washers 1S between the collars 10 and 11 and the hub portions of the respective connector bars.

Any suit-able means may be provided for rotating the shaft 9 and thus adjusting the movable condenser plate but l prefer that the shaft 9 shall be provided at one or both end portions with al socket 19 which may be non-circular in shape to receive the end of an operating shaft 29, the end of which is shaped to .titwithin `the socket 19. The end portions of the shaft 9 are provided with annular recesses 21 and the shaft 20 has a collar Z2v which lits within one of these annular recesses and limits the inward movement of the shaft. rlhe shaft has mounted on its outer end an operating handle, such as a knob. 23, and if desired there may be connected with the shaft a suitable indicator' to indicate to the opera.- tor the position of the movable condenser plate. As here shown, a dial Q4 is rigidly secured to the knob 23 so as to rotate in unison with the shaft. This dial may be provided with a series of indications with which may cooperate a ixed pointer, or indication, on the sidewall of the indicator but these indications are not here shown as they form no part of the invention.

The condenser thus provided is of a small compact form and has a relatively large capacity. lf it is desired to utilize two or more of these condensers as a single condenser in order to increase the capacity thereof, this may be done by connecting together two condensers, or units,of the type above described. The two units may be connected by means of bolts of sutlicient length` to extend through both condensers. The shafts 9 of the two units may be operated in unison by a single controlling' device by connecting the same one to the other, as shown in Fig. 6. To accomplish this l provide a suitable connecting shaft 25, the end portions of which are non-circular to lit into the sockets of the two condenser shafts. Preferably the noncircular portions of the shaft are separated by a collar 26 which lits into the annular recesses 21 in the ends of the shafts 9, and thus correctly positions the connecting shaft with relation to the condenser shafts. 1t will be apparent that whenv the shaft-slof two or more condenser unit-s have been connected in this manner they will all berotated simultaneously by the manipulation of the controlling handle, or knob, 23.

In the operation of radiophone receiving .sets it is preferable that the initial adjustment, or tuning in, be accomplished by the use of a condenser of relatively large capacity, and that the finer adjustmentsshould be accomplished by a supplemental condenser of smaller capacity. I have, in Fig. 1, shown a supplemental condenser of such a character that it can be connected with one of the condenser units and made an integral part thereof, but may be controlled and operated separately from the main condenser. As here shown, the supplemental condenser consists of a casing 27 adapted to be secured to the wall of the main condenser and arraged to form within the same a chamber. ln the present device the casing for the supplemental condenser .is in the form of a disk of insulating` material ofthe same diameter as the sections 1 of the main easing and is provided with a circumferential laterally eX- tending flange 28 which bears against the adjacent section 1 of the main casing and thus spaces the intermediate portion of the inner wall of the casing 27 away from the wall of the section 1 and provides the desired chamber. The casing 27 may be attached to the casing 1 in any suitable manner as by extending the screws 3 through both casings. Mounted within the chamber in the casing 27 is a movable condenser 1nember, or plate, 29, which is mounted on a hol The collar 32 is provided with ahub portion 33 which is rigidly secured to the shaft 30, preferably by pressing the saine thereon and` Vwhich forms the journal, or bearing, portion of the shaft 30; The inner end of the shaft 30 extends-,into the adjacent end of the hollow shaft 9 ofthe main lcondenser but isv i the casing 27 and has a hub portion 35 which forms a bearing for the hub portion 33 of the collar 32. The outer end of the connector bar 34 extends beyond the edge of the casing and is preferably connected with the outer ends of the connector bars 14, this being accomplished by extending the bolt 17 through the several connector bars. The shaft 30 may be rotated in any suitable manner, but in the present construction the operating shaft for the main condenser .is hollow and extending through this hollow shaft is another shaft 36, the end of which is screw threaded into the hollow shaft of the vernier condenser and extends beyond the same where it is provided with a locking nut 37. The opposite end of the shaft 36 has rigidly secured thereto an operating handle, or knob, 38. It will be apparent therefore, that the movable members of the two condensers are rotatable about a common axis but that they areindependent! ly controlled so that one may be adjusted relatively to the other, and that the movable plate of the supplemental condenser coopcrates with the nearest fixed plate of the main condenser.

While I have shown and described one embodiment of my invention I wish it to be understood that I do not `desire to be limited to the details thereof as various modilications may occur to a person skilled in the art.

.Having` now fully described my invention what' I claim as new and desire to secure by Letters Patent, is: Y

1. In a condenser.` a casing comprising 4two sections of insulating material rigidly connected one to the other' and arranged to form a chamber between them, two condenser plates molded into the respective sections of said casing, and arranged side by side but spaced one from the other, a movable condenser plate mounted in said chamber for rotatory movement into and out of the space between the first mentioned plates,

and sheets ofdielectr-ic material arranged between said movable plate and the respec-V tive first` mentioned plates. i

2.-,In a condenser', a casing comprising two ser-.tions of insulating material rigidly conn'ected one to the other, afc'ondenser plate molded into each of "said sections and having its inner face lsubstantially flush vwith the adjacent portions of said section, said sections having cooperating parts'to space` said Acondenser plates one from the other, a

shaftfjournaled insaid casing, a condenserV plate mountedf on Vsaid shaft and arranged'` tobe moved `into and out of the space'between the -lirst mentioned condenser plates, a-ndineansfor rotatingsaid shaft.`

3.In a condenser, a `casing` comprising two substantially similar sections ofA in`su' lating material'each` having a laterally extending circumferential flange, the flanges of the two sectionsbeingA arranged `to abut one `against the other and form a chamber between said sections, condenser plates rigidly secured to the inner faces of the respective sections, a shaft jouriialed in said casing, a movable condenser plate mounted on said shaft for movement into and out of the space between the first mentioned plates` and sheets of dielectric material interposed between said movable condenser and the respective first mentioned condenser plates.

4. In a condenser, a Vcasing comprising two sections of insulatingl material, connected one to the other and arranged to form a chamber between them, two condenser plates rigidlysupported within said chamber and spaced apart, a shaft journaled in said casing, a condenser plate rigidly se-v cured vto said shaft and movable into and out of the space Abetween the first mentioned condenser plates, a connector bar mounted in said chamber and having a part embra ing said shaft and held in firm electrical contact therewith, and sheets of dielectric ma` terial interposed between said condenser plate and said stationary condenser plates.y

5. In a condenser. a casing comprising two sections of insulating material rigidly connected one to the other and arranged to form a, chamber between them, two con denser plates rigidly supported within said chamber and spaced aparta shaft having its ends journaled in the respective sections of said casing, a condenser plate having a hub portion embracing saidshaft, means for rigidly securing the last mentioned condenser plate to said shaft, means for rotating said shaft to canse said last mentioned condenser plate to be moved into and out 1 of the space between the first mentionedV condenser plates` and sheets of dielectric material interposed between said movable condenser plate and said firstmentioned con denser plates,

6. In a condenser, a casing comprising two sections Vof insulating material rigidly connected one to the other and arranged to form a chamber between them, two condenser plates rigidly supported within said chamber and spaced apart, a hollow shaft having its ends journaled inthe respective sections of said casing, a condenser plate rigidly secured to said shaft and movable into and out of the space between the rst mentioned condenser plates, sheets of diY electric material interposed between said movablecondenser plate and the respective lirst mentioned condenser plates, an operating shaft having a portion adapted to enter one end of said hollow shaft, and a connecting member having its two ends adapted to enter the adjacent ends of the hollow shafts of ltwo condensers placed face to face, thereby connecting the movable plates oi"- the two condensers for simultaneous opera-tion.

7. The combination with a condenser comprising a casing, consisting of two sections of insulating material rigidly connected one to the other and arranged to forni a chamber between them, stationary -condensing plates mounted within said chamber, a sha'lt journaled in said chamber, a condenser plate mounted on said shaft for movement into and out of the space between said stationary condenser plates, and a hollow operating shaft operatively connected with the iirst mentioned shaft, of a supplemental casing rigidly secured to the first mentioned casing, a shaft journaled in said supplemental casing in axial alin'emcnt with the first mentioned shaft, a condenser plate carried by the last mentioned shaft, and an operating shaft extending through said hollow operating shaft and operatively connected with the shaft in said supplemental casing. Y

1' In testimony whereof, I ailix my signature iereto.

IVILLIAM H. PETIT. n 

